The basic properties of the ferronickel slag powder produced by roller mill have been tested. The influence of ferronickel slag powder as the concrete admixture to the mechanical performance, work performance and durability of concrete has been investigated based on 30% and 40% mixed proportions, and compared with grade S95 slag powder and grade II fly ash. Results show that the slump and mechanical performance of concrete using ferronickel slag powder as the admixture are slightly worse than the slag powder and fly ash concrete, with nearly the same setting time as slag powder concrete but less setting time than grade II fly ash concrete. Based on appropriate mixed proportions, the frost resistance and carbonization resistance of ferronickel slag powder concrete are equivalent to those of slag powder and grade II fly ash concrete.

VPM (vertical pregrinding mill) is specially designed for cement pregrinding, which has the advantages of higher grinding efficiency and higher running stability compared with the roller press system. In this paper, the cement grinding process system composing of VPM and tube mill has been optimized in order to decrease the energy consumption.

With increasingly stringent emission standards (30mg/Nm³) for cement plants, more and more electric precipitators used before the cooler fan have been transformed into bag filters in China. To protect the bag filter, a stable and reliable cooling device is needed to cool the high temperature cooler waste gas in case of troubleshooting of the waste heat boiler. And cooler spraying system has been widely used in transforming electric precipitator into bag filter projects, with the characteristics of lower investment and operation cost. And it can realize constant, rapid and accurate control of the waste gas temperature, which can protect the bag filter effectively .